• 基本释义

1.Daquan Company regards craft brother as friends regards customers as god strives for development in competition takes “non-stop technical innovation excelsior production zealous and thoughtful customer service” as the principle of enterprise opens up new ways forward constantly.
达权公司视同行为朋友、视用户为上帝，在竞争中求发展，矢志不渝以“永不停留的技术创新，精益求精的产品制造，热情周到的顾客服务”为企业宗旨，不断开拓前进。收藏指正
2.There is a common knowledge,including how to comprehend the implication of quantification,using directly,using transformed and the realization of implication in the mathematical calculations performed tuple relationship(especially the ALPHA)and RDB standard language SQL. Uniting the example of case,introduces some new teaching thinking,teaching methods for craft brother to consult and exchange. So have made the better teaching result.
在元组关系演算(尤其是元组关系演算语言ALPHA)和关系数据库标准语言中,量词的含义 理解、直接使用、转换使用以及蕴涵功能(Implication)的实现等是教学难点,结合案例提出了讲授 这些知识点的一些新思路和新方法,取得了较好的教学效果.收藏指正
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